diff --git a/nselib/http.lua b/nselib/http.lua
index a18d6b40b..4980611fe 100644
--- a/nselib/http.lua
+++ b/nselib/http.lua
@@ -1449,7 +1449,7 @@ local read_auth_challenge = function(s, pos)
     end
   end
 
-  return pos, { scheme = scheme, param = param }
+  return pos, { scheme = scheme, params = params }
 end
 
 ---